Cataract

eye with a cataract

eye with a cataract

Crystalline lens inside an eye is working together with the cornea surface to bend the light and focus the picture on the retina.  Young natural human lens is able to contract and expand  to focus on close and distant objects giving us full range of vision. When the combination of the lens and cornea is not appropriate to focus the light on the retina precisely, we develop near- and farsightedness, with or without astigmatism. This is correctable with LASIK/PRK or lens extraction and replacement of it with an artificial lens.

 

The natural lens becomes progressively harder and cloudier with age, more notable after 40.  A cataract is the clouding of the natural lens that leads to blurry vision even with glasses, contact lenses or even after laser surgery. The clouding in the lens disrupts transmission of light through the lens. Vision may be blurred, dark, and distorted. Ultrasound can be used to break it up and remove it during a surgical procedure known as cataract extraction or phacoemulsification. An artificial lens is then inserted to replace the darkened cataract and to focus the image properly on the retina.